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Sagot :
Answer:
Explanation:
We will assume there is no Kinetic energy when the body reaches the bottom of the ramp (since this info was not given)
Then the work will be equal to the negative change in Potential Energy (mgh)
m = 2 kg g = 10 m/s^2 h = 4 sin30 =2 m
mgh = 2 x 10 x 2 = 40 Joules of work
the change in potential energy is
-40 J ....then the work is - -40 = + 40 J
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